Milling-machine



G. T. TRUNDLE, Jn.

MILLING MACHINE.

APPLlcATIo/N FILED rss. 23. 19m.

Patented Nov. 9', 1920.

A 76M; Va/ 4227# 5.

3 SHEETS-SHEET I.

G. T. TRUNDLE, JR.

MILUNG MACHINE.

` APPLICATION FILED FEB. 23 QIB. 1 ,358,040. Patented Nov. 9, 1920.

3 SHEETS-SHEET 2- G. T. TRUNDLE, Jn.

M|LL|NG MACHINE. APPLICATION FILED FEB. 23. I9I8.

Patented Nov. 9, 1920.

3 SHEETS-SHEET 3.

lnk/ Infor 137 Wwf/Eff narran s'rnres efr-asir onirica.;

GEORGE T. TRUNDLE, JRL, 0F CLEVELAND, G-IO, ASSQIGNR TG THE AMERICAN MULTIGRAPH COMPANY, 0F CLEVELAND, Ol-O, L CORPORATION OF OHIO.

MILLING-MACHINE.

resented nov. e, le20.

Application fired February 2s, 1ers. serial No. 213,850.

To all wim/1n, it may concern:

Ee it lrnown that l, Gnouoii T. Tiiuiannn, Jr., a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, hare invented a certain new and useful lmprovement in MillinglvLla-chines, of which the following is a full, clear, and exact description, referencebcing had to the accompanying drawings.A`

The object or' this invention is to provide a simple and efficient mechanism for milling arenal grooves in suitable blanks, as for example, in certainy parts oitl time iuses. My mechanismY includes a rotary spindle carrying a suitable end mill, an `oscillatory chuck which may carry the blank opposite the end of the cutter, and means for feeding the cutter longitudinally into the blank while the latter is oscillating. lily inveir tion includes also the means for yieldingly clamping the blank to the oscillatory work holder, the means for oscillating' such work holder, and the means for readily changing the presentation of the blank to the milling Quitter, to enable the cutting of a. plurality of independent grooves. ,My invention is hereinafter more fully described in connection with the drawings, and the essential characteristics are summarized in the claims.

ln the drawings, Figure 1 is a plan ol' my milling machine, the clamping handle i'or the chuck being partly broken away, Fig. 2 is a Vvertical section along the axis oit the chuck and milling cutter, being accordingly ou an otlset plane; Fig. 3 is a sectional eleratioii of the machine looking from the right hand end: Fig. el is an elevation lookrom the leift hand end; Fig. 5 is a View looking at the inner end of the work spindie; llig. o' is a side elevation of the inner end portion of the work spindle; Fig. 'T is a horiyiontal section through the chuclrs of the l work spindle and cutter, being in the plane ot the rotary axes; Fig-.8 is a side elevation and Fig. 9 a plan or' a simple luse part i hayino` arcual grooves adapted to be cut by c T y P the mechanism of higs. 1 to n As shown in Figs. 1 to 4:, 10 indicates a suitable bed plate rigidly carrying a standard 11 on which a carriage 12 is slidably guided. As shown, `the Acarriage 12 has a dove-tailed rib 18 which engages a guideway iii the standard. The carriage is shown as having two arms in which is journaled a rotary spindle 13 carrying a pulley 14 by which it may be rotated. it the inner end of this spindle is a collet 15 for clamping the critter 16, which consists of an end mill.

To move the spindle longitudinally, l mount in the standard 1l a rotary screw 2O having an operating cranlr 21 and l secure to the carriage 12 a nut 22 on the screw. A suitable stop is provided to limit the movement of theV carriage. Such stop is shown in the form of screw 25 threaded through a lug 19 on the bed plate and bearing against a hardened block 26 mounted in the carriage 12.

i@pposite the end of the cutter spindle, hut out or axial alineinent with it, is a work spindle 30 mounted iii the standard 31 secured to the bed l0. As shown in Fig. 2 the work spindle comprises a suitable sleeve extending through the standard, there loe-- ing an interposed bearing sleeve The center oi the work spindle. is hollow and is occupied by a shizttable rod Se, which, at its forward end, engages a yoke 35 carrying a pair of jaws 36 formed with reference to the worl to be clamped. At its outer end the rod 34 carries a pivoted cani 3S having an operating handle 39. The cam is shown as bearing against -a .plate f-lwhich is pressed away from the end oitjthe sleeve 30 by suitable interposed compression springs l1. This enables the cani to apply a spring tension to the jaws. A compression spring eli-l surrounds the bar e0 between theyole in an enlarged bore lof the spindle and is compressed between the base oI such enla ment and the yoke 555. This spring has a greater throw than the springs l1 (the extension of which is liin ited) and 'res to release the jaws when the cam 53 allows it.

ris shown in Figs. 2, 5, 6 and 7, there is mounted ou the inner end ollr the vspindle `30 a plate having openings le through which the jaws 36 extend.V This plate is.

i of radial ribs l The form of the jaws and of the face plate projections is chosen with reference to the article to be clamped. Figs and 9 illustrate an article which the jaws and face plate in Figs. 5, -6 and 7 mayreadilyv clamp. t This. article comprises a screwthreaded plug A having a central bore a, a conical head a and a pair of diametrically opposed radial notches a2 extending through the head tothe bore.

l/Vith the machine as shown, such a blank as just described is placed Vagainst the face plate with the central stud 47 occupying the bore a and the ribs 48 entering the notches a2. "When the blank is being placed, the jaws 36 are some distance away from theface plate 45 andthe blank is put into position between the two arms of the yoke 35. After the blank is in place the tightening of the cam 38 causes the jaws36 to seat on the inclined head a and effectively clamp the blank to the face plate 45. At the same time the springs 41 prevent i the jaws 36 engaging the head a with sufficient force to injure it.

lt'is the object of the specific mechanism shown to mill arcual grooves into the head of the blankrAbetween tl e centralbore a and the screw thread. To leffect this, l provide meansffor oscillating the work spindle 30 about its axis by an amount corresponding to the length of the groove to be milled. After one groove has been milled the withdrawal of the cutter enables the work spindle to be turned to bring a fresh portion yof the blank opposite the cutter.

As shown in Fig. 9, the finished article A has *twoV diametrically `opposed arcual grooves a3, each extending for about ninety degrees. To mill such grooves the spindle n is given an oscillation through a range of -about ninety degrees to enableone groove to be milled and then after the cutter' has been withdrawn the spindle is given a half rotation and again oscillated Vthrough a range of about ninety degrees. The oscillating mechanism is shown in Figs. 1, 2

and 4 and will now be described,

Rigid on the end portion-of the sleeve 30 beyond the standard 81 is a disk 50 having in its edge a pair of diametrically positioned notches 51: Pivoted at 55 to a boss 56 rising from the bed plateris'a guide bar 54 which stands between the disk 50 and the end of the bed plate. This guide bar has an arcual slot 57 which is struck about a radius corresponding to the distance from the center of the work spindle to the center of one of the notches 51. therefore may lie alongside of the disk with the outer edge of the slot about alining with-the periphery of the disk. 60 indicates a pin which is slidably mounted inthe slot 57 and is adapted to occupy'one kof the The arcual slot 57 the disk. At such otherl side this pin is mounted in a link 62 which is pivoted at its other end at 63 to a crankarni 64 on an operating shaft 65. rlhis shaft is suitably journaled in a portion 'of the `frame (as for example the VV sub-base66) and isV rotated in anyy suitable manner. Y

` The vrotation of the shaft 65 rotates the crank 64, which, by reason of the link 62, reciprocates-the pin 60 in the slot 5 7.'Llf,the bar 54 carrying this slot is in the position shown in Vl `ig4 the pin 60 will occupy one Vof the notches 51 so that its reciprocation will turn the disk 50 and hence the work spindle about the axis thereofsubstantially ninety degrees in one direction and back to .the initialpoint for each rotation of the vto give the work spindle a half rotation to present another portion of the blank to the cutter. This is accomplished by moving the lever 54 downwardly about its pivot 55 to carry the pin 60 out of the notch 5l. rlhis leaves the work spindleV and the disk 50 entirely free and the same Vmay be turned by hand to the new position, the operator taking hold of the handle 39 or the projecting end 30 of the spindle as is more convenient.` After the diskv has been given approximately a half turn the slotted lever 54 is returned to engaging position and the pin 60 comes into the other notch 51, thereby properly oscillating, the blank to enable the milling of the othergroove a3. I

To effectively look the slotted lever 54 in its engaging position, and also allow it to be `the offset portion-of the slot 7 4, extending above and below the stationary pin 5,' locks the slotted bar in its elevated position and thus-,holds the pin 60 in engagement with one of the notches 51. i

When the pin 60 is to be freedfrom a llO notch of the oscillating head, the operator grasps the handles 68 and 72 and squeezes them together, thus swinging the slotted bell-crank arm 70 toward the rear and bringing into registration With the pin a portion of the slot -il which is then concentric of the axis lViththe locking dog in this position it ceases to hold the slotted par elevatedV and the bar and dog may therefore be depressed to free the pin 60 from the notch 51. i

Tt is to be understoodthat the pin 60 Will only pass out of the notch 51 or into such notch When the pin 60 is in the lower portion of the slot 57. However', the oscillations are rapid enough so thatthe operator need pay no attention to the particular position of thel pin when he takes hold of the 'handles (58 and 72. He disengages the locking handle as soon as he takes hold of it and applies a pressureto the handle 68 which becomes effective as soon as the continuously moving connecting. rod 62 brings the pin into the lowe most portion ofthe slot, Where the movement about the axis 55 substantially coincides with the radius of the disk. The notches 51 are slightly flaring to prevent binding and to allow some range to this movement. y

In operation, the operator throws the cam lever 39 to open the chuck and puts the blank in place ivith his lingers and then clamps it by turning the lever 89 toward the spindle. lf the spindle is not standing with one of the notches 51 approximately at the lowermost position, the operator turns the spindle into such position. He then presses upon the handle 68 and as soon as the pin 60 comes into registration with the bottom notch 51 it engages the same and the oscillation of the blank starts. The release of the handle 72 by the operator locks the bar 54 in the elevated position.

The operator now feeds the cutter carriage gradually toward the left by rotation of the hand crank 21, whereby the endmill 16 mills the groove as the Work spindle oscillates. The feeding of the cutter is continued until the carriage is brought to a stop by abutting the screw 25 which has been positioned according to the depth of the groove desired. This completes one groove. Then the carriage is Withdrawn by the reverse rotation of the hand crank 21.

The operator now takes hold of the handles 68 and 72, squeezing them together and applying a downward pressure, which results in depressing them and carrying the' pin 60 free from the disk, as soon as it reaches the bottom of its stroke. Then the operator gives a half rotation to the Work spindle, raises the handles 68 and 72, and operates the cutter spindle as before to mill the other groove c3. VAt the completion of this groove and the Withdrawal of thecutter, the handles 68 and 72 are again dropped, stopping the rotation of the Work spindle, and the cam handle 39 is turned out to loosen the jaivs 36 to release the finished article.

Having thus described my invention, wha I claim is 1. In a milling machine, the combination of a rotary spindle adapted to carry a cutter, a chuck adapted to carry a blank opposite the end of the cutter, mechanism for automatically oscillating the chuckand means for continuously rotating the cutter.

2. In a milling machine, the combination of a continuously rotating cutter spindle, a Work spindle out of axial alinement with the cutter spindle, automatically operating means for oscillating the Work spindle, and means for Ycausing relative feeding movement between the cutter carried by the cutter spindle and the blank carried by the Work spindle.

3. In a milling machine, the combination of a rotary spindle adapted to carry an end mill, a Work spindle positioned beyond the end of the cutter spindle but out of axail alinement therewith, means for clamping a blank on the end of the Work spindle, automatically operating means for oscillating the Work spindle, and means for feeding the cutter spindle toward the blank during the oscillation.

4. In a milling machine, the combination of a rotary spindle, means for carrying an end mill at one end of the spindle, a shiftable carriage carrying said spindle, a Work holder having a movable clamping jaiv, mechanism for automatically oscillating the Work holder during the cutting operation, and means for movino' the carriage toward the work holder.

5. Tie combination of a rotary spindle adapted to carry a cutter, a Workholding spindle out of axial alinement with the cutter spindle, means for clamping a blank axially on the'end of the Work holding spindle, means for moving the cutter into and out of engagement with the blank, ali-ony tinuously moving reciprocatory device, and mechanism for causing said device to engage the vrork spindle or for Vfreeing it therefrom as desired.

6. The combination of a rotary spindle adapted to carry a cutter, a Work holding spindle, means for clamping a blank axially on the end of the Work holding spindle and out of axial alinement with the cutter, means for moving the cutter into and out of engagement with the blank, ahead on the Work spindle, a guide adjacent to the head, means continuously re'ciprocated along said guide and adapted to be engaged to the head or be free therefrom according to the 7, The combination With the spindle adapted to carry a cutting tool, ofaspin die to carry the Work, a head on said 4Work ate guide :tor said pin,.means .for `moving the guide to carry the pin toward or from the notched` head, andmeans for reciprocating the pin along the guida.,

9. The combination oi' a spindle having a notched head, a movable member having an arcuate slot adjacent to the edge of the head, a pin. occupying said slot andadapted to engage a notch of the head. or clear it according to the position .of said member, and .means or. reciprocating the, pin in the slot. i

10. The combination oi a spindle provided With means for clamping a blank thereon, a notched disk upon the spindle, adapted toturnit, a lever lying along side of the "disk andhaving an arcuate-.slot `adjacent to its periphery, said lever being adapted to move toward or from the axis of the spindle, a pin occupying said slot ,and adapted to engage a notch in the head, and means for reciprocating the sin. .11. Thecombination .with a cutting tool, of awvork holding spindle having ahead with a plurality of notches, an arcuate guide adjacent to the edge of the head, al member.

incvablealong said guide `and adapted to engage a notch of the head or` clear it according to the position oit the guide, and means for reciprocating said member along said guide for a shorter angular range than the angular distance between the notches. in thehead. .f

l2. The combination, with a cutting tool, of a Work holding spindle, a `disk upon the spindle having a pairo'f diametrically opposed notches, a lever having an arcuateV slot adjacent to the periphery ot said disk. and extending for abouta quarter oi' a circumference, a pin occupying said slot and adapted to engage either notch'in the head, means for reciprocating the pin, and means 'or holding the lever in position.

13. The combination of la spindle, la

notched diskupon the spindle, adapted to turn it, an arcuate guide movablymcunted adjacent to the periphery of the disk, a member movable along said guide and adapted to engage a notch in the head, means for reciprocatingthe member, anda lock-ing deviceadapted yto hold Isaid'guide in position to maintain said memberinthe notch, said lockingA device having means whereby it maybe .movedto unlock said guide.

Thefcombination of a ivork holding spindle, a..iiotche,d, disk upon. the spindlek adapted to turn it, a lever havingy an arcuate slot 'adjacent to thel periphery of the disk, a pin occupyingsaid slot and adapted `to engageanotch in the head, means :tor

reciprocating the pin, and a locking device` adapted to hold said lever in position to ,maiiitainthe pin yin .the'notcln said locking device: having means whereby it may be .dle adjacent tothe handle of the lever.

16. The .combination of a cutting tool, of a Work holding. spindlehaving a notched head, aV pivotedlever .lying adjacent to the edge of the head and having a guide, a pin movable alongsaid .guide `and adapted to engage a notch of thehead or clear itaccording tothe position of the` lever, `said lever having an .operating handle, and .a' `lock for holding the lever in operative pokition and consisting of a bell-crankpivoted to the lever and having one arm `adapted to engage a stationary stop and the other .arm tormedinto a releasing handle -adjacent to .the handle ofthe lever..

. .17. In fa. milling` machine ,the` combina `adjacent to its periphery and having `an arcuate slot, a Ipin occupying' said slot and adapted to engage a notch inthe disk, a crank, and` a pitman .connecting it .With-.a pin. n

19..The combinationwith a rotary spindle adapted `to carry alcuttingtool, of a Work holding spindle, a Achuck carried thereby, adapted to ,hold a blank on the end of the spindle in positionv tobe `engagedby the cutting tool, means extending through` the` spindlev and `operable from` the other end for clamping ory releasing the chuck, atdisk on said Work 4spindle.having.a plurality ,of

notches, a` .pivoted lever` having an arcuate `slot adjacent Itolthe. edge` ofthe disk, apin` ion ier

iio

occupying said slot, a crank, a pitman connecting with the pin, and means for latching the lever in position to hold the pin in engagement with the notch.

20. In a milling machine, the co1nbina tion of a rotary spindle, a cutting toolrcarried thereby, an oscillatory Work spindle, a jaw for clamping a blank on the end of the Work spindle, operating means for the jaws including a rod connected with the jaw and extending longitudinally through the Work spindle and means for moving the rod, and means for rotating the cutter spindle and for automatically oscillating the work spindle during the cutting operation.

2l. rI`he combination with a rotary spindle adapted to carry a cutting tool, of an oscillatory spindle having a positioning plate on its end, a longitudinally movable clamp carried by the oscillatory spindle and er-:tending through the end plate, a longitudinal rod in the oscillatory spindle for operating the clamp, and mechanism for automatically oscillating the said oscillatory spindle during the cutting operation and :for feeding the rotary spindle toward it.

22. rllhe combination with a rotary spindle adapted to carry a cutting tool, oi an oscillatory spindle, a longitudinal movable clamp carried by the oscillatory spindle `and adapted to hold a blank against one end of the spindle, a longitudinal rod in the oscillatory spindle for operating the clamp, a

cam carried by said rod adapted to bear against a head yieldingly carried on the other end of the oscillatory spindle, mechanism for automatically oscillating thesaid oscillatory spindle, and means for feeding the rotary spindle toward it during such oscillation.

23. In a milling machine, the combination of a rotary spindle, a cutter adapted to be carried thereby, a chuck adapted to carry a blank opposite the end of the cutter, means for giving said chuck a rotative movement about an axis parallel with the spindle axis, said cutter and blank coacting during the operation, and an automatic operating mechanism for moving one of them back and forth With reference to the other during the cutting operation.

24. In a milling machine, the combination of a rotary spindle, a cutter adapted to be carried thereby, a 4chuck adapted to carry a blank opposite the end of the cutter,

means for causing the cutter and blank to come into engagement, and mechanism for automatically oscillating one of such members While the other is in engagement therewith. Y

In testimony whereof I hereunto affix my signature.

GEORGE T. TRUNDLE, JR. Witnesses:

J. W. FINIGAN, GEO. J. EASTERDAY. 

